package com.lb.config;

import com.alibaba.fastjson.serializer.SerializerFeature;
import com.alibaba.fastjson.support.config.FastJsonConfig;
import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;

import org.springframework.boot.autoconfigure.http.HttpMessageConverters;
import org.springframework.http.converter.HttpMessageConverter;

import java.nio.charset.Charset;

/**
 * Date: 2019-3-1
 * Description:
 */
public class HttpMessageConverterConfig {
    //引入Fastjson解析json，不使用默认的jackson
    //必须在pom.xml引入fastjson的jar包，并且版必须大于1.2.10

    public HttpMessageConverters fastJsonHttpMessageConverters() {
        // 定义一个convert转换消息的对象
        FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter();
        // 添加fastjson的配置信息
        FastJsonConfig fastJsonConfig = new FastJsonConfig();
        SerializerFeature[] serializerFeatures = new SerializerFeature[]{
                //    输出key是包含双引号
                //  SerializerFeature.QuoteFieldNames,
                //    是否输出为null的字段,若为null 则显示该字段
                SerializerFeature.WriteMapNullValue,
                //    数值字段如果为null，则输出为0
                SerializerFeature.WriteNullNumberAsZero,
                //     List字段如果为null,输出为[],而非null
                SerializerFeature.WriteNullListAsEmpty,
                //    字符类型字段如果为null,输出为"",而非null
//                SerializerFeature.WriteNullStringAsEmpty,
                //    Boolean字段如果为null,输出为false,而非null
                SerializerFeature.WriteNullBooleanAsFalse,
                //    Date的日期转换器
                SerializerFeature.WriteDateUseDateFormat,
                //    循环引用
                SerializerFeature.DisableCircularReferenceDetect
        };

        fastJsonConfig.setSerializerFeatures(serializerFeatures);
        fastJsonConfig.setCharset(Charset.forName("UTF-8"));

        // 在convert中添加配置信息
        fastConverter.setFastJsonConfig(fastJsonConfig);
        // 将convert添加到converts中
        return new HttpMessageConverters((HttpMessageConverter<?>) fastConverter);
    }
}
